ACRYLIC COPOLYMER AND COATING AGENT AND SHRINK FILM EACH USING THE SAME

Document Type and Number:

Japanese Patent JP2005008785

Kind Code:

A

Abstract:

To provide a shrink film in which long-term storage can be carried out without generating blocking of a roll in a state stored at ordinary temperature, and low-temperature shrink properties, resistance to natural shrinkage and ultraviolet ray-blocking property are improved while maintaining appearance and machinability, and an acrylic copolymer used for obtaining the shrink film.

The acrylic copolymer is obtained by copolymerizing 5-65 mass% at least one kind of ultraviolet ray-absorbing monomer selected from a benzophenone-based ultraviolet ray-absorbing monomer and a benzotriazole-based ultraviolet ray-absorbing monomer as an essential comonomer component. The acrylic copolymer has ≥10,000 number-average molecular weight (Mn) expressed in terms of polystyrene and 1.0-3.0 molecular weight distribution (Mw/Mn) represented by a ratio of a mass average molecular weight (Mw) expressed interms of polystyrene to Mn and 0-100°C glass transition temperature (Tg). The shrink film in which a coated film of the coating agent is formed is obtained by applying a coating agent containing the acrylic copolymer to a shrink film.